Tactical flexibility, innovative training methods, attacking football (apparently), fluent English, studied the coaching side of the game from a young age, and seemingly natural inteligence
http://www.chroniclelive.co.uk/sport/football/football-news/john-carver-rejects-accusations-fielded-8379134
He's basically the Anti-Pardew.
It's the role play part of the interview where they test how good he is at lying to fans and taking the flak.